681749453 has 48 divisors (see below), whose sum is σ = 916997760. Its totient is φ = 494376960.

The previous prime is 681749449. The next prime is 681749459. The reversal of 681749453 is 354947186.

681749453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681749453 - 2² = 681749449 is a prime.

Its product of digits (725760) is a multiple of the sum of its prime divisors (567).

It is a junction number, because it is equal to n+sod(n) for n = 681749398 and 681749407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681749459) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1626878 + ... + 1627296.

It is an arithmetic number, because the mean of its divisors is an integer number (19104120).

Almost surely, 2^681749453 is an apocalyptic number.

It is an amenable number.

681749453 is a deficient number, since it is larger than the sum of its proper divisors (235248307).

681749453 is a wasteful number, since it uses less digits than its factorization.

681749453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 567 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The square root of 681749453 is about 26110.3323035154. The cubic root of 681749453 is about 880.1194108792.

The spelling of 681749453 in words is "six hundred eighty-one million, seven hundred forty-nine thousand, four hundred fifty-three".